16X discs can be pretty expensive and may be hard to come by. It may be cheaper to get hold of 8X discs. Also, if you get hold of 8X discs with the following media codes, you can burn them at 12X on the 4163B :
So it can be quite a bargain. These are DVD+R discs. The 4163B can burn ONLY these 8X discs at 12X. It won't do it with DVD-R discs either.